Just a few months ago, cities all over the world were in the midst of a mobility renaissance. New forms of shared and connected mobility were taking root, augmenting overburdened public-transit systems and offering convenient, eco-friendly alternatives for commuting and urban travel. Then came COVID-19. When lockdowns halted normal everyday life, commuting and leisure trips for many millions of people came to an abrupt halt. Urban transportation usage plummeted to its lowest level in decades.